To complete the D-558 family, this is the Douglas proposal for a D-558 follow-on (Model 671) and then for an early X-15 configuration (Model 684). Credit: Steeljaw Scribe
To complete the D-558 family, this is the Douglas proposal for a D-558 follow-on (Model 671) and then for an early X-15 configuration (Model 684). Credit: Steeljaw Scribe
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